Intelligence, in military science, information concerning an enemy or an area. The term is also used for an agency that gathers such information.

Military intelligence is as old as warfare itself. Even in biblical times, Moses sent spies to live with the Canaanites in order to learn about their ways and about their strengths and weaknesses. In the American RevolutionGeorge Washington relied heavily on information that was provided by an intelligence net based in New York City, and in World War II the results of a lack of good intelligence were realized in the destruction of the U.S. Pacific fleet at Pearl Harbor.

Today, nations have at their disposal information collection and processing systems that permit gathering and producing intelligence more rapidly and more accurately than ever before. Satellites, ultramodern aircraft, electronic systems, human sources, cameras, imaging and electronic devices, and a host of other systems permit the amassing of information on a scale that was unheard of in the past.

Levels of intelligence

Intelligence is conducted at two levels, strategic and tactical. Strategic intelligence is information that is needed to formulate policy and military plans at the international and national policy levels. Tactical intelligence is intended primarily to respond to the needs of military field commanders so they can plan for and, if necessary, conduct combat operations. Essentially, tactical intelligence and strategic intelligence differ only in scope, point of view, and level of employment.

Whether tactical or strategic, military intelligence attempts to respond to or satisfy the needs of the operational leader, the person who has to act or react to a given set of circumstances. The process begins when the commander determines what information is needed to act responsibly. Several terms are used when discussing these requirements. On the national level they are usually called the essential elements of information and are defined as those items of intelligence information about a foreign power, armed force, target, or physical environment that are absolutely vital for timely and accurate decision making. On the tactical level intelligence needs are defined in a similar manner; often called information requirements, they are those items of information concerning the enemy and his environment that must be collected and processed in order to meet the intelligence needs of the military commander.

Sources of intelligence

It is critical for the intelligence analyst to know the source of information. Depending on the nature of a problem, certain sources are of great value and are therefore considered of high quality, while other sources, although contributing to the production of intelligence, are supportive rather than critical in nature.

Following are the major sources of intelligence.

Acoustics

This is information derived from analyzing acoustic waves that are radiated either intentionally or unintentionally. In naval intelligence, underwater acoustic waves from surface ships and submarines are detected by sonar arrays. These sensors are extremely accurate and are a major source of information on submarines in the world’s oceans.

Imagery

This is information gleaned from analyzing all types of imagery, including photography as well as infrared and ultraviolet imagery. The examination of imagery, called imagery interpretation, is the process of locating, recognizing, identifying, and describing objects, activities, and terrain that appear on imagery.

Imagery collected by satellites and high-altitude aircraft is one of the most important sources of intelligence. It not only provides information for a huge number of intelligence categories (such as order of battle, military operations, scientific and technical developments, and economics), but it is indispensable for successfully monitoring compliance with arms-limitation treaties. The Intermediate Nuclear Forces Treaty of 1987 allowed the United States to periodically request that the Soviet Union open certain intercontinental ballistic missile sites so that U.S. satellites (referred to as “national technical means”) could verify that the sites did not house intermediate-range missiles banned by the treaty.

Tactical infrared imaging devices can often identify camouflaged tanks and armour because the materials used to cover them—trees, branches, and leaves—often register different infrared signatures than does the surrounding foliage. Infrared satellites can register heat through clouds, producing imagery on enemy forces, equipment, and movements.

Communications intelligence is gleaned from foreign communications that are intercepted by other than the intended recipients. Such intelligence can be of the greatest value to a nation’s fighting forces because it allows them to be privy to the strategies, weaknesses, and attitudes of the enemy. For example, before and during World War II, the U.S. Navy’s breaking of the Japanese PURPLE code allowed the United States to know of Japanese moves in advance. It even provided warning of the attack on Pearl Harbor, although this intelligence was not sent to Hawaii quickly enough to prevent the debacle.

Electronics intelligence (also called ELINT) is technical and intelligence information obtained from foreign electromagnetic emissions that are not radiated by communications equipment or by nuclear detonations and radioactive sources. By analyzing the electronic emissions from a given weapon or electronic system, an intelligence analyst can very often determine the purpose of the device.

Telemetry intelligence is technical information that is derived from intercepting, processing, and analyzing foreign telemetry data. For example, by intercepting the telemetry signals emitted during foreign ballistic missile tests, an intelligence agency can calculate the range, accuracy, and number of warheads of the weapon.

Radiation

This source of intelligence does not include energy emanating from nuclear detonations or radioactive sources. Rather, it concerns unintentional emissions of energy from electronic systems (while ELINT is based on intentional radiations from the same systems). Inadequate shielding of electronic systems, or the following of incorrect procedures, may result in inadvertent energy emissions, which, when analyzed, may reveal a great deal about a system’s purpose or capabilities.

Foreign matériel

In 1976 a Soviet air force lieutenant, wishing to defect to the West, flew a MiG-25 Foxbat to Japan, where Japanese and U.S. technicians pored over every detail of the supersonic fighter before reassembling it and handing it back to its owners. Such analysis of a foreign weapon system can prove invaluable in producing systems to defeat it, and intelligence derived from any foreign matériel is of great value in assessing enemy capabilities.

Human agents

Often called HUMINT, human intelligence is provided by people rather than by technical means and is very often provided by spies and covert agents. Spies are often a prime source of information about a nation’s political leaders, strategies, and political decisions. The Soviet colonel Oleg Penkovsky, for example, was a very important source for British and U.S. intelligence until he was arrested and executed in 1963. The political, scientific, and technical information he provided included data on the capabilities of Soviet intermediate-range missiles during the Cuban missile crisis. Likewise, the Philby–Burgess–Maclean spy ring, which penetrated the highest circles of Britain’s MI-6 intelligence agency, provided the Soviets with a tremendous amount of information on British and Allied military and counterintelligence operations during and after World War II. In the United States, the Walker family sold the Soviet Union classified reports on the tracking of Soviet submarines and surface ships. Operating from 1968 until it was broken up in 1985, this spy ring did irreparable damage to the submarine warfare capabilities of the U.S. Navy.

Julius and Ethel Rosenberg during their 1951 trial for espionage.

AP

Types of intelligence

In most situations, intelligence production involves the assessment of conflicting pieces of incomplete information, the attempt to determine the correct items, and then the processing and assembly of these accurate items into a complete, understandable document that responds to the needs of the operational leader. More often than not the resulting product, which is usually called an intelligence appraisal or intelligence assessment, contains some incorrect information.

In order to structure this production, analysts divide intelligence into types. While all types of intelligence are valuable, in any given situation some may be of greater worth than others, may be more accurate, and may provide a more complete view of the situation. By dividing intelligence into types, analysts and commanders arrive at a better understanding of the value and accuracy of a given piece of information.

Armed forces

Information on a potential enemy’s armed forces—that is, personnel, training, equipment, bases, capabilities, manpower levels, disposition, readiness, and other factors pertaining to strength and effectiveness—is crucial for a nation that is about to enter combat. If the weaknesses can be exploited, then the conflict may be won more quickly and with fewer casualties. Toward the end of World War II, owing to incomplete intelligence it was predicted that Japan would fight resolutely against a U.S. invasion and that the United States might suffer up to one million casualties. This was a major factor in the decision to drop the atomic bomb on Hiroshima and Nagasaki. In reality, though, Japanese resolve was grossly overestimated, and Japan could probably have been conquered with far fewer Allied casualties.

Biographical

This is information collected on the views, traits, habits, skills, importance, relationships, health, and professional history of the leaders and important individuals of a nation. Biographical intelligence is important to those who must decide whether to support a foreign leader. For example, when Fidel Castro first came to power in Cuba in 1959, he claimed to be a nationalist and was even allowed to conduct a speaking tour in the United States. Subsequently, however, Castro revealed that he was a communist who intended to transform Cuba into a Soviet-style state. More accurate intelligence on Castro might have revealed his intentions more promptly, and U.S. foreign policy could have been revised accordingly.

In clandestine operations, one of the most difficult problems is assessing the validity of an individual who volunteers his services to an intelligence organization. Very often, information on the family life, education, travels, and professional and political affiliations of such a person provides great insight into motivation and can help in verifying authenticity.

Cartographic

Derived from maps and charts, cartographic intelligence is crucial for all military operations. During the Falkland Islands War, for example, British forces depended heavily on cartography. They also interviewed schoolteachers and scientists who had recently left the islands so that they had the most accurate information possible on road conditions, towns, and facilities. This prepared invading troops to meet the obstacles caused by rough terrain and poor roads, and as a result the invasion went remarkably well.

Economic

This is information concerning the production, distribution, and consumption of goods and services, as well as labour, finance, taxation, and other aspects of a nation’s economy or of the international economic system. Economic intelligence allows a nation to estimate the magnitude of possible military threats and is also valuable in estimating the intentions of a potential enemy. In wartime, economic intelligence is a prime indicator of an enemy’s ability to sustain a war. This is particularly important when analyzing small nations, such as Israel, where a conflict requires total mobilization and cannot be sustained for long without creating severe economic problems.

Energy

Energy intelligence specifically addresses the location and size of foreign energy resources; how these resources are used and allocated; foreign governments’ energy policies, plans, and programs; new or improved foreign energy technologies; and the economic and security aspects of foreign energy supply, demand, production, distribution, and use.

Energy requirements can be an important factor in military planning. For example, as German forces were advancing on Moscow during World War II, Hitler, on being informed that the German military was short of fuel, sent several of the advancing units southward to capture the oil complexes at Baku on the Caspian Sea. This move so depleted the forces advancing on Moscow that they failed to capture the city, dealing the German war effort a fatal setback. Later, on the Western Front, advancing Allied forces were so short of fuel that U.S. general George Patton’s 3rd Army was forced to stop and await replenishment. This allowed the retreating Germans to dig in and prolong the war.

Counterintelligence

Counterintelligence is intended to detect, counteract, and prevent espionage and other clandestine intelligence activities, sabotage, terrorist attacks, or assassinations conducted on behalf of foreign powers, organizations, or persons. It is especially vital that nations identify the capabilities and intentions of international terrorist organizations so that their operations can be thwarted; in the event that a terrorist attack is successful, identifying the culprit allows for reprisals, which are crucial to combating terrorism. In December 1988 an American commercial aircraft was destroyed over Scotland, and neither the United States nor Great Britain initially could identify the terrorist organization involved. As a result, the act was successful from the perspective of the terrorists, who had injured their enemy without suffering retaliation.

Geographic

Gained from studying natural characteristics including terrain, climate, natural resources, transportation, boundaries, and population distribution, military geographic intelligence involves evaluating all such factors that in any way influence military operations.

Geographic intelligence was crucial to the success of Israel’s rescue mission at the Entebbe airport in Uganda in 1976. Because they had reliable information on the exact location of the buildings at the airport, of the roads leading to Entebbe, and of military bases in the region, Israeli soldiers were able to land in three transport planes, kill many of the terrorists holding Israeli hostages, and depart with most of the hostages before the Ugandan military could react. A significant factor in the disastrous U.S. attempt to rescue its hostages in Iran in 1980 was a failure to anticipate and prepare for seasonal sandstorms, which disabled several helicopters and forced the rescuers to abort their mission.

Medical

This is intelligence gained from studying every aspect of foreign natural and man-made environments that could affect the health of military forces. This information can be used not only to predict the medical weaknesses of an enemy but also to provide one’s own forces with adequate medical protection. For example, in the Spanish-American War the majority of U.S. casualties in the Caribbean resulted from disease rather than combat, because U.S. forces were not prepared to deal with the environment of that region.

Sociological

Information on a nation’s social stratification, value systems, beliefs, and other social characteristics are of crucial value in assessing nations such as South Africa, the Soviet Union, or Israel, where national, racial, or social factions can have a great impact on a nation’s military capability.

A lack of good sociological intelligence was a major cause of U.S. blunders in dealing with revolutionary Iran. When Mohammad Reza Shah Pahlavi was overthrown in 1979, the United States had only the most superficial understanding of Islām and Iranian society, and the situation improved only slightly in subsequent years. As a result, the United States often remained ignorant about Iranian officials, calling them “radical” or “moderate” even when such terms did more to cloud a situation than to make it clear.

Transportation and telecommunication

This type of intelligence can be crucial to correctly assessing a nation’s ability to wage war, as it concerns a nation’s highways, railroads, inland waterways, and civil airways as well as its telephone, telegraph, and civil broadcast capabilities. When China sent troops across the border into Vietnam in 1979, many observers assumed that China would win the conflict. This estimate was based on the huge size of the Chinese army and on its excellent performance against United Nations forces in the Korean War. After China failed to score a decisive victory, the same commentators examined China’s transportation and telecommunication networks and found that, while they were very highly developed in the Northeast, they were quite primitive in the South. It was concluded that the advanced northeastern systems and the primitive southern systems were prime factors in China’s success in Korea and in its lackluster performance in Vietnam.